I've seen this question on Quora and one of the answers had the following sentence.
Cohomology is one of those things that seems really complicated the first time you see it, and slowly starts to make more sense once you have more experience.
And I thought, I need a word whose definition is exactly this sentence.
He encouraged me to continue to study computer science, because he thinks that computer science is ____.
Note that this sentence asks for an adjective. I am also happy with a noun, as in
... computer science is a ____.